Started delving into the network data collected via collectd. Noticed that pve3 had pretty serious packet drop. Noticed it on my monitoring Banana Pi as well: each “host is online”-check sends out three pings and sometimes one of the three would fail.
Found some bad configuration with the trunks on my HP switch but that didn’t solve the problem. Maybe some VM on pve3 was using so much bandwidth it caused the host to drop packets? Let’s cap the VMs that can be suspected of using lots of bandwidth in bursts and see what happens.
Yeay!